Hii..
Yes you are eligible to apply for jee main in 2021 ..as you mentioned that you  complete your in year 2019 ..
So as per eligibility criteria a candidates are eligible to attempt jee main three time including the year they pass 10+2 three consecutive year ...
All the best!!

Hey there

JEE mains is conducted from a few years twice in a year. Since you have attempted one attempt of jee mains you have two more chances for JEE mains and one chance of jee advanced.

Check about JEE mains

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/exams/jee-main&ved=2ahUKEwjinYyX3NfkAhUhmI8KHSs_C_QQFjAAegQIBBAB&usg=AOvVaw1k3rMyr-Osb0qy4gsPfOaR

Check about JEE advanced

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/exams/jee-advanced&ved=2ahUKEwiD3K-n3NfkAhUEY48KHatyAFQQFjAAegQIAxAB&usg=AOvVaw27auQU717YYuHGYaNfL5SD

Good luck

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